Are there any free tools that can convert Outlook .ost files to .pst files?

This page summarizes the projects mentioned and recommended in the original post on /r/techsupport
Outlook ost2pst Pstfileviewer ost pst

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  • ost2pst

    OST2PST - converts Outlook OST files to PST format

  • XstReader

    Xst Reader is an open source viewer for Microsoft Outlook’s .ost and .pst files, written entirely in C#. To download an executable of the current version, go to the releases tab.

    • Only works for OST files from pre Outlook 2013. I had a quick look though Github and found this: https://github.com/Dijji/XstReader, which can read the .ost file and export the individual items to .html, .rtf and .txt which could help someone if they're desperate.

  • InfluxDB

    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

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NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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